forked from Minki/linux
b14c8e6afd
When a completion is declared on-stack we have to use
COMPLETION_INITIALIZER_ONSTACK().
Fixes: 0b81d07790 ("fs crypto: move per-file encryption from f2fs
tree to fs/crypto")
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
108 lines
2.6 KiB
C
108 lines
2.6 KiB
C
/*
|
|
* fscrypt_private.h
|
|
*
|
|
* Copyright (C) 2015, Google, Inc.
|
|
*
|
|
* This contains encryption key functions.
|
|
*
|
|
* Written by Michael Halcrow, Ildar Muslukhov, and Uday Savagaonkar, 2015.
|
|
*/
|
|
|
|
#ifndef _FSCRYPT_PRIVATE_H
|
|
#define _FSCRYPT_PRIVATE_H
|
|
|
|
#include <linux/fscrypt_supp.h>
|
|
|
|
#define FS_FNAME_CRYPTO_DIGEST_SIZE 32
|
|
|
|
/* Encryption parameters */
|
|
#define FS_XTS_TWEAK_SIZE 16
|
|
#define FS_AES_128_ECB_KEY_SIZE 16
|
|
#define FS_AES_256_GCM_KEY_SIZE 32
|
|
#define FS_AES_256_CBC_KEY_SIZE 32
|
|
#define FS_AES_256_CTS_KEY_SIZE 32
|
|
#define FS_AES_256_XTS_KEY_SIZE 64
|
|
#define FS_MAX_KEY_SIZE 64
|
|
|
|
#define FS_KEY_DESC_PREFIX "fscrypt:"
|
|
#define FS_KEY_DESC_PREFIX_SIZE 8
|
|
|
|
#define FS_KEY_DERIVATION_NONCE_SIZE 16
|
|
|
|
/**
|
|
* Encryption context for inode
|
|
*
|
|
* Protector format:
|
|
* 1 byte: Protector format (1 = this version)
|
|
* 1 byte: File contents encryption mode
|
|
* 1 byte: File names encryption mode
|
|
* 1 byte: Flags
|
|
* 8 bytes: Master Key descriptor
|
|
* 16 bytes: Encryption Key derivation nonce
|
|
*/
|
|
struct fscrypt_context {
|
|
u8 format;
|
|
u8 contents_encryption_mode;
|
|
u8 filenames_encryption_mode;
|
|
u8 flags;
|
|
u8 master_key_descriptor[FS_KEY_DESCRIPTOR_SIZE];
|
|
u8 nonce[FS_KEY_DERIVATION_NONCE_SIZE];
|
|
} __packed;
|
|
|
|
#define FS_ENCRYPTION_CONTEXT_FORMAT_V1 1
|
|
|
|
/* This is passed in from userspace into the kernel keyring */
|
|
struct fscrypt_key {
|
|
u32 mode;
|
|
u8 raw[FS_MAX_KEY_SIZE];
|
|
u32 size;
|
|
} __packed;
|
|
|
|
/*
|
|
* A pointer to this structure is stored in the file system's in-core
|
|
* representation of an inode.
|
|
*/
|
|
struct fscrypt_info {
|
|
u8 ci_data_mode;
|
|
u8 ci_filename_mode;
|
|
u8 ci_flags;
|
|
struct crypto_skcipher *ci_ctfm;
|
|
struct key *ci_keyring_key;
|
|
u8 ci_master_key[FS_KEY_DESCRIPTOR_SIZE];
|
|
};
|
|
|
|
typedef enum {
|
|
FS_DECRYPT = 0,
|
|
FS_ENCRYPT,
|
|
} fscrypt_direction_t;
|
|
|
|
#define FS_CTX_REQUIRES_FREE_ENCRYPT_FL 0x00000001
|
|
#define FS_CTX_HAS_BOUNCE_BUFFER_FL 0x00000002
|
|
|
|
struct fscrypt_completion_result {
|
|
struct completion completion;
|
|
int res;
|
|
};
|
|
|
|
#define DECLARE_FS_COMPLETION_RESULT(ecr) \
|
|
struct fscrypt_completion_result ecr = { \
|
|
COMPLETION_INITIALIZER_ONSTACK((ecr).completion), 0 }
|
|
|
|
|
|
/* crypto.c */
|
|
extern int fscrypt_initialize(unsigned int cop_flags);
|
|
extern struct workqueue_struct *fscrypt_read_workqueue;
|
|
extern int fscrypt_do_page_crypto(const struct inode *inode,
|
|
fscrypt_direction_t rw, u64 lblk_num,
|
|
struct page *src_page,
|
|
struct page *dest_page,
|
|
unsigned int len, unsigned int offs,
|
|
gfp_t gfp_flags);
|
|
extern struct page *fscrypt_alloc_bounce_page(struct fscrypt_ctx *ctx,
|
|
gfp_t gfp_flags);
|
|
|
|
/* keyinfo.c */
|
|
extern int fscrypt_get_crypt_info(struct inode *);
|
|
|
|
#endif /* _FSCRYPT_PRIVATE_H */
|